Implement shared format_output method to render outputs

[A554551N]

format_output should:

• handle padding for fields (presumably all of them, since we're doing the work)
• Center header row names?
• check when output is approaching max size (2000 chars) and split the output into multiple list elements to be posted.
• repost the header on each new message
• return a list of messages to be sent by the bot

Considering format support_functions.format_output(format_str|str,header_elements|tuple,returned_list_from_db|tuple)

• format_str is an old style format string ("| ID# | %s | %s)
• header_elements are the field names that comprise the header
• returned_list_from_db is a tuple containing the returned data